2011/02/24 by Kevin Young, Kevin C. Young, K. Birgitta Whaley · 3 citations
Chemistry · Computer Science · Physics and Astronomy · #Algorithm #Artificial intelligence #Biological system #Chemistry #Coherence (philosophical gambling strategy) #Computational physics #Computer science #Decoupling (probability) #Dephasing #Dynamical decoupling #Noise (video) #Physics #Quantum #Quantum Information and Cryptography #Quantum mechanics #Quantum optics and atomic interactions #Qubit #Robustness (evolution) #Spectroscopy and Quantum Chemical Studies #Statistical physics #quant-ph
paper · pdf · doi:10.1103/physreva.86.012314
10 pages, 3 figures
arxiv created 2011/02/24 · openalex publication_date 2012/07/13 · arxiv updated 2013/05/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a procedure for direct characterization of the dephasing noise acting on a single qubit by making repeated measurements of the qubit coherence under suitably chosen sequences of controls. We show that this allows a numerical reconstruction of the short-time noise correlation function and that it can be combined with a series of measurements under free evolution to allow a characterization of the noise correlation function over many orders of magnitude range in time scale. We also make an analysis of the robustness and reliability of the estimated correlation functions. Application to a simple model of two uncorrelated noise fluctuators using decoupling pulse sequences shows that the approach provides a useful route for the experimental characterization of dephasing noise and its statistical properties in a variety of condensed phase and atomic systems.